feat: add application timeline history (#3237)

* feat: add application timeline history

* fix: address application timeline review

* fix: keep application tracker e2e stable

* fix: use stable timeline e2e selector

* fix: target timeline note input in e2e

migrations/20260708210217_wonderful_captain_midlands/migration.sql

@@ -0,0 +1,116 @@
+WITH entries AS (
+	SELECT
+		a.id AS application_id,
+		entry.value AS entry,
+		entry.ordinality,
+		coalesce(nullif(entry.value ->> 'id', ''), md5(a.id || ':' || entry.ordinality::text)) AS entry_id,
+		coalesce(nullif(entry.value ->> 'at', ''), a.applied_at::text, a.created_at::text, now()::text) AS entry_at,
+		lower(coalesce(entry.value ->> 'text', '')) AS entry_text
+	FROM "application" a
+	CROSS JOIN LATERAL jsonb_array_elements(
+		CASE WHEN jsonb_typeof(a.activity) = 'array' THEN a.activity ELSE '[]'::jsonb END
+	) WITH ORDINALITY AS entry(value, ordinality)
+),
+normalized AS (
+	SELECT
+		application_id,
+		ordinality,
+		CASE
+			WHEN entry ->> 'type' = 'stage'
+				AND entry ->> 'stage' IN ('saved', 'applied', 'screening', 'interview', 'offer', 'rejected') THEN
+				jsonb_build_object('id', entry_id, 'type', 'stage', 'stage', entry ->> 'stage', 'at', entry_at)
+			WHEN entry ->> 'type' IN ('created', 'stage')
+				AND CASE
+					WHEN entry_text LIKE '%screening%' THEN 'screening'
+					WHEN entry_text LIKE '%interview%' THEN 'interview'
+					WHEN entry_text LIKE '%offer%' THEN 'offer'
+					WHEN entry_text LIKE '%rejected%' THEN 'rejected'
+					WHEN entry_text LIKE '%applied%' THEN 'applied'
+					WHEN entry_text LIKE '%saved%' THEN 'saved'
+				END IS NOT NULL THEN
+				jsonb_build_object(
+					'id', entry_id,
+					'type', 'stage',
+					'stage', CASE
+						WHEN entry_text LIKE '%screening%' THEN 'screening'
+						WHEN entry_text LIKE '%interview%' THEN 'interview'
+						WHEN entry_text LIKE '%offer%' THEN 'offer'
+						WHEN entry_text LIKE '%rejected%' THEN 'rejected'
+						WHEN entry_text LIKE '%applied%' THEN 'applied'
+						WHEN entry_text LIKE '%saved%' THEN 'saved'
+					END,
+					'at', entry_at
+				)
+			ELSE
+				jsonb_build_object(
+					'id', entry_id,
+					'type', 'note',
+					'text', coalesce(nullif(btrim(entry ->> 'text'), ''), 'Imported timeline entry'),
+					'at', entry_at
+				)
+		END AS normalized_entry
+	FROM entries
+),
+grouped AS (
+	SELECT application_id, jsonb_agg(normalized_entry ORDER BY ordinality) AS activity
+	FROM normalized
+	GROUP BY application_id
+)
+UPDATE "application" a
+SET activity = grouped.activity
+FROM grouped
+WHERE a.id = grouped.application_id;
+--> statement-breakpoint
+UPDATE "application"
+SET activity = jsonb_build_array(
+	jsonb_build_object(
+		'id', md5(id || ':stage'),
+		'type', 'stage',
+		'stage', status,
+		'at', coalesce(applied_at::text, created_at::text, now()::text)
+	)
+)
+WHERE jsonb_typeof(activity) IS DISTINCT FROM 'array' OR activity = '[]'::jsonb;
+--> statement-breakpoint
+WITH stage_stats AS (
+	SELECT
+		a.id AS application_id,
+		max((entry.value ->> 'at')::timestamptz) FILTER (WHERE entry.value ->> 'type' = 'stage') AS latest_stage_at,
+		max((entry.value ->> 'at')::timestamptz) FILTER (
+			WHERE entry.value ->> 'type' = 'stage' AND entry.value ->> 'stage' = a.status
+		) AS current_stage_at
+	FROM "application" a
+	CROSS JOIN LATERAL jsonb_array_elements(
+		CASE WHEN jsonb_typeof(a.activity) = 'array' THEN a.activity ELSE '[]'::jsonb END
+	) AS entry(value)
+	GROUP BY a.id
+),
+anchors AS (
+	SELECT
+		a.id,
+		a.status,
+		greatest(
+			coalesce(stage_stats.latest_stage_at, a.applied_at, a.created_at, now()),
+			coalesce(a.applied_at, a.created_at, now())
+		) AS anchor_at,
+		stage_stats.latest_stage_at,
+		stage_stats.current_stage_at
+	FROM "application" a
+	LEFT JOIN stage_stats ON stage_stats.application_id = a.id
+	WHERE jsonb_typeof(a.activity) = 'array'
+)
+UPDATE "application" a
+SET activity = a.activity || jsonb_build_array(
+	jsonb_build_object(
+		'id', md5(a.id || ':stage:' || a.status || ':anchor'),
+		'type', 'stage',
+		'stage', a.status,
+		'at', anchors.anchor_at::text
+	)
+)
+FROM anchors
+WHERE a.id = anchors.id
+	AND (
+		anchors.current_stage_at IS NULL
+		OR (anchors.latest_stage_at IS NOT NULL AND anchors.current_stage_at < anchors.latest_stage_at)
+	);